I'm not sure where you're getting your info (perhaps you saw the price for the remainder of this season) but it used to be $100-$120 depending on which
Even you bought. It went up slightly this year, though I'm not sue how much since they let returning subscribers keep the old rate.
I don't follow baseball so please correct me if this information is for something less than it seems to me. A quick google search brought up two services (MLB.tv and MLB Extra Innings). The former seems to cost about $40-$50 while the latter is in the $200 range for the season. Also, Extra Innings looks like an add on package to an existing cable/satellite subscription while MLB.tv is a standalone service.